(IUCr) Crystallography Journals Online

[Contents scheme]

Acta Cryst. (2012). E68, o2700-o2701
[ doi:10.1107/S1600536812034691 ]

5-Amino-3-(4H-1,2,4-triazol-4-yl)-1H-1,2,4-triazole

B. Liu, J. P. C. Tomé, L. Cunha-Silva and F. A. Almeida Paz

Abstract: The asymmetric unit of the title compound, C₄H₅N₇, comprises two independent but virtually superimposable molecules. Each molecule is planar with the dihedral angles between the five-membered rings being 2.8 (3) and 2.1 (3)°. The crystal structure is formed by an extensive network of relatively strong N-HN hydrogen-bond interactions. Individual molecules are arranged into supramolecular zigzag chains running parallel to [001] by way of the strongest N-HN interactions. Adjacent chains are interconnected by rather long (DA distances range from ca 3.00 to 3.03 Å) but highly directional (interaction angles above ca 173°) hydrogen bonds forming a supramolecular layer in the bc plane.